acute - noun

a mark (') placed above a vowel to indicate pronunciation

acute - adjective

• having or experiencing a rapid onset and short but severe course
• of an angle; less than 90 degrees
• extremely sharp or intense
• having or demonstrating ability to recognize or draw fine distinctions
• ending in a sharp point
• of critical importance and consequence

acute - thesaurus

acuate   ague   discriminating   incisive   intense   keen   knifelike   needlelike   penetrating   penetrative   piercing   sharp